<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>鼠标跟随</title>
    <style>
      * {
        padding: 0;
        margin: 0;
      }
      html,
      body {
        height: 100%;
      }
      #app {
        width: 100%;
        height: 100%;
      }
    </style>
  </head>
  <body>
    <div id="app">鼠标位置:({{ position.x }},{{ position.y }})</div>
  </body>

  <script src="../lib/vue.global.js"></script>
  <script>
    const { reactive, onMounted, onUnmounted } = Vue;
    Vue.createApp({
      setup() {
        const position = reactive({
          x: 0,
          y: 0,
        });

        const updatePosition = (event) => {
          position.x = event.pageX;
          position.y = event.pageY;
        };

        onMounted(() => {
          document.addEventListener("mousemove", updatePosition, false);
        });

        onUnmounted(() => {
          document.removeEventListener("mousemove", updatePosition, false);
        });

        return {
          position,
        };
      },
    }).mount("#app");
  </script>
</html>
